goods='0123456789'

function getkey(e)
{
if (window.event)
   return window.event.keyCode;
else if (e)
   return e.which;
else
   return null;
}
function goodchars(e)
{
var key, keychar;
key = getkey(e);
if (key == null) return true;
keychar = String.fromCharCode(key);
keychar = keychar.toLowerCase();
goods = goods.toLowerCase();
if (goods.indexOf(keychar) != -1)
return true;
if ( key==null || key==0 || key==8 || key==9 || key==13 || key==27 )
return true;
return false;
}